body {
  display: flex;
  flex-direction: column;
  text-align: center;
  justify-content: safe center;
  height: 100vh;
  margin: 0;
  opacity: 0;
}

.nav {
  display: flex;
  text-align: center;
  justify-content: safe center;
  flex-wrap: wrap;
  gap: 50px;
  margin-top: 60px;
  a {
    margin-top: 20px;
    text-decoration: none;
    color: #000;
  }
}

.preview {
  width: 1366px * 0.3;
  height: 768px * 0.3;
  overflow: hidden;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
  border-radius: 10px;
  iframe {
    width: 1366px;
    height: 768px;
    transform: scale(0.3);
    transform-origin: 0 0;
  }
}